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Waves and stimulus-modulated dynamics in an oscillating olfactory network

K R Delaney1, A Gelperin, M S Fee

  • 1AT&T Bell Laboratories, Murray Hill, NJ 07974.

Proceedings of the National Academy of Sciences of the United States of America
|January 18, 1994
PubMed
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Researchers studied electrical activity in the Limax maximus snail

Area of Science:

  • Neuroscience
  • Olfactory system research
  • Molluscan neurobiology

Background:

  • The procerebral lobe is the olfactory organ in the terrestrial mollusc Limax maximus.
  • This lobe shows intrinsic oscillations in its field potential.
  • Two classes of neurons, phase-locked to these oscillations, have been identified.

Purpose of the Study:

  • To investigate the temporal dynamics of electrical activity in the Limax maximus procerebral lobe.
  • To understand how neuronal activity relates to intrinsic oscillations and large-scale electrical patterns.
  • To determine the effect of natural odor stimuli on these electrical dynamics.

Main Methods:

  • Intracellular recordings to identify neuronal classes and their firing patterns.
  • Voltage-sensitive dye imaging to visualize large-scale electrical activity.

Related Experiment Videos

  • Simultaneous optical and intracellular recordings to correlate neuronal activity with field potentials.
  • Application of natural odor stimuli to observe responses.

    • Main Results:

    • Two neuron classes were identified: one bursting, the other inhibited, both phase-locked to oscillations.
    • Electrical activity propagates as waves across the lobe, reflecting the activity of both neuron classes.
    • Odor stimuli transiently disrupt wave propagation, leading to spatially uniform oscillations.

    Conclusions:

    • The procerebral lobe exhibits complex electrical dynamics involving oscillating and propagating wave activity.
    • Odor stimulation alters these dynamics, switching from waves to uniform oscillations.
    • These findings offer insights into the neural processing of olfactory information in molluscs.